package com.javastudy.apache.lang;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.CharSet;
import org.apache.commons.lang3.CharSetUtils;
import org.apache.commons.lang3.ClassUtils;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.SerializationUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.SystemUtils;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DateUtils;
import org.apache.commons.lang3.time.StopWatch;
import org.apache.commons.lang3.StringEscapeUtils;

/**
 * @author Administrator http://commons.apache.org/proper/commons-lang/userguide.html
 */
public class LangDemo {
  public void charSetDemo() {
    System.out.println("**CharSetDemo**");
    CharSet charSet = CharSet.getInstance("aeiou");
    String demoStr = "The quick brown fox jumps over the lazy dog.";
    int count = 0;
    for (int i = 0, len = demoStr.length(); i < len; i++) {
      if (charSet.contains(demoStr.charAt(i))) {
        count++;
      }
    }
    System.out.println("count: " + count);
  }

  public void charSetUtilsDemo() {
    System.out.println("**CharSetUtilsDemo**");
    System.out.println("计算字符串中包含某字符数.");
    System.out.println(CharSetUtils.count("The quick brown fox jumps over the lazy dog.", "aeiou"));

    System.out.println("删除字符串中某字符.");
    System.out.println(CharSetUtils.delete("The quick brown fox jumps over the lazy dog.", "aeiou"));

    System.out.println("保留字符串中某字符.");
    System.out.println(CharSetUtils.keep("The quick brown fox jumps over the lazy dog.", "aeiou"));

    System.out.println("合并重复的字符.");
    System.out.println(CharSetUtils.squeeze("a  bbbbbb     c dd", "b d"));
  }

  public void objectUtilsDemo() {
    System.out.println("**ObjectUtilsDemo**");
    System.out.println("Object为null时，默认打印某字符.");
    Object obj = null;
    System.out.println(ObjectUtils.defaultIfNull(obj, "空"));

    System.out.println("验证两个引用是否指向的Object是否相等,取决于Object的equals()方法.");
    Object a = new Object();
    Object b = a;
    Object c = new Object();
    System.out.println(ObjectUtils.equals(a, b));
    System.out.println(ObjectUtils.equals(a, c));

    System.out.println("用父类Object的toString()方法返回对象信息.");
    Date date = new Date();
    System.out.println(ObjectUtils.identityToString(date));
    System.out.println(date);

    System.out.println("返回类本身的toString()方法结果,对象为null时，返回0长度字符串.");
    System.out.println(ObjectUtils.toString(date));
    System.out.println(ObjectUtils.toString(null));
    System.out.println(date);
  }

  public void serializationUtilsDemo() {
    System.out.println("*SerializationUtils**");
    Date date = new Date();
    byte[] bytes = SerializationUtils.serialize(date);
    System.out.println(ArrayUtils.toString(bytes));
    System.out.println(date);

    Date reDate = (Date) SerializationUtils.deserialize(bytes);
    System.out.println(reDate);
    System.out.println(ObjectUtils.equals(date, reDate));
    System.out.println(date == reDate);

    FileOutputStream fos = null;
    FileInputStream fis = null;
    try {
      fos = new FileOutputStream(new File("d:/test.txt"));
      fis = new FileInputStream(new File("d:/test.txt"));
      SerializationUtils.serialize(date, fos);
      Date reDate2 = (Date) SerializationUtils.deserialize(fis);

      System.out.println(date.equals(reDate2));

    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } finally {
      try {
        fos.close();
        fis.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

  }

  public void randomStringUtilsDemo() {
    System.out.println("**RandomStringUtilsDemo**");
    System.out.println("生成指定长度的随机字符串,好像没什么用.");
    System.out.println(RandomStringUtils.random(500));

    System.out.println("在指定字符串中生成长度为n的随机字符串.");
    System.out.println(RandomStringUtils.random(5, "abcdefghijk"));

    System.out.println("指定从字符或数字中生成随机字符串.");
    System.out.println(RandomStringUtils.random(5, true, false));
    System.out.println(RandomStringUtils.random(5, false, true));

  }

  public void stringUtilsDemo() {
    System.out.println("**StringUtilsDemo**");
    System.out.println("将字符串重复n次，将文字按某宽度居中，将字符串数组用某字符串连接.");
    String[] header = new String[3];
    header[0] = StringUtils.repeat("*", 50);
    header[1] = StringUtils.center("  StringUtilsDemo  ", 50, "^O^");
    header[2] = header[0];
    String head = StringUtils.join(header, "/n");
    System.out.println(head);

    System.out.println("缩短到某长度,用...结尾.");
    System.out.println(StringUtils.abbreviate("The quick brown fox jumps over the lazy dog.", 10));
    System.out.println(StringUtils.abbreviate("The quick brown fox jumps over the lazy dog.", 15, 10));

    System.out.println("返回两字符串不同处索引号.");
    System.out.println(StringUtils.indexOfDifference("aaabc", "aaacc"));

    System.out.println("返回两字符串不同处开始至结束.");
    System.out.println(StringUtils.difference("aaabcde", "aaaccde"));

    System.out.println("截去字符串为以指定字符串结尾的部分.");
    System.out.println(StringUtils.chomp("aaabcde", "de"));

    System.out.println("检查一字符串是否为另一字符串的子集.");
    System.out.println(StringUtils.containsOnly("aad", "aadd"));

    System.out.println("检查一字符串是否不是另一字符串的子集.");
    System.out.println(StringUtils.containsNone("defg", "aadd"));

    System.out.println("检查一字符串是否包含另一字符串.");
    System.out.println(StringUtils.contains("defg", "ef"));
    System.out.println(StringUtils.containsOnly("ef", "defg"));

    System.out.println("返回可以处理null的toString().");
    System.out.println(StringUtils.defaultString("aaaa"));
    System.out.println("?" + StringUtils.defaultString(null) + "!");

    System.out.println("去除字符中的空格.");
    System.out.println(StringUtils.deleteWhitespace("aa  bb  cc"));

    System.out.println("判断是否是某类字符.");
    System.out.println(StringUtils.isAlpha("ab"));
    System.out.println(StringUtils.isAlphanumeric("12"));
    System.out.println(StringUtils.isBlank(""));
    System.out.println(StringUtils.isNumeric("123"));
  }

  public void systemUtilsDemo() {
    System.out.println(genHeader("SystemUtilsDemo"));
    System.out.println("获得系统文件分隔符.");
    System.out.println(SystemUtils.FILE_SEPARATOR);

    System.out.println("获得源文件编码.");
    System.out.println(SystemUtils.FILE_ENCODING);

    System.out.println("获得ext目录.");
    System.out.println(SystemUtils.JAVA_EXT_DIRS);

    System.out.println("获得java版本.");
    System.out.println(SystemUtils.JAVA_VM_VERSION);

    System.out.println("获得java厂商.");
    System.out.println(SystemUtils.JAVA_VENDOR);
  }

  public void classUtilsDemo() {
    System.out.println(genHeader("ClassUtilsDemo"));
    System.out.println("获取类实现的所有接口.");
    System.out.println(ClassUtils.getAllInterfaces(Date.class));

    System.out.println("获取类所有父类.");
    System.out.println(ClassUtils.getAllSuperclasses(Date.class));

    System.out.println("获取简单类名.");
    System.out.println(ClassUtils.getShortClassName(Date.class));

    System.out.println("获取包名.");
    System.out.println(ClassUtils.getPackageName(Date.class));

    System.out.println("判断是否可以转型.");
    System.out.println(ClassUtils.isAssignable(Date.class, Object.class));
    System.out.println(ClassUtils.isAssignable(Object.class, Date.class));
  }

  public void stringEscapeUtilsDemo() {
    System.out.println(genHeader("StringEcsapeUtils"));
    System.out.println("转换特殊字符.");
    System.out.println("html:" + StringEscapeUtils.escapeHtml4("/n\n"));
    System.out.println("html:" + StringEscapeUtils.unescapeHtml4("<p>"));
  }

  private final class BuildDemo {
    String name;

    int age;

    public BuildDemo(String name, int age) {
      this.name = name;
      this.age = age;
    }

    public String toString() {
      ToStringBuilder tsb = new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE);
      tsb.append("Name", name);
      tsb.append("Age", age);
      return tsb.toString();
    }

    public int hashCode() {
      HashCodeBuilder hcb = new HashCodeBuilder();
      hcb.append(name);
      hcb.append(age);
      return hcb.hashCode();
    }

    public boolean equals(Object obj) {
      if (!(obj instanceof BuildDemo)) {
        return false;
      }
      BuildDemo bd = (BuildDemo) obj;
      EqualsBuilder eb = new EqualsBuilder();
      eb.append(name, bd.name);
      eb.append(age, bd.age);
      return eb.isEquals();
    }
  }

  public void builderDemo() {
    System.out.println(genHeader("BuilderDemo"));
    BuildDemo obj1 = new BuildDemo("a", 1);
    BuildDemo obj2 = new BuildDemo("b", 2);
    BuildDemo obj3 = new BuildDemo("a", 1);

    System.out.println("toString()");
    System.out.println(obj1);
    System.out.println(obj2);
    System.out.println(obj3);

    System.out.println("hashCode()");
    System.out.println(obj1.hashCode());
    System.out.println(obj2.hashCode());
    System.out.println(obj3.hashCode());

    System.out.println("equals()");
    System.out.println(obj1.equals(obj2));
    System.out.println(obj1.equals(obj3));
  }

  public void numberUtils() {
    System.out.println(genHeader("NumberUtils"));
    System.out.println("字符串转为数字(不知道有什么用).");
    System.out.println(NumberUtils.toInt("ba", 33));

    System.out.println("从数组中选出最大值.");
    System.out.println(NumberUtils.max(new int[] { 1, 2, 3, 4 }));

    System.out.println("判断字符串是否全是整数.");
    System.out.println(NumberUtils.isDigits("123.1"));

    System.out.println("判断字符串是否是有效数字.");
    System.out.println(NumberUtils.isNumber("0123.1"));
  }

  public void dateFormatUtilsDemo() {
    System.out.println(genHeader("DateFormatUtilsDemo"));
    System.out.println("格式化日期输出.");
    System.out.println(DateFormatUtils.format(System.currentTimeMillis(), "yyyy-MM-dd HH:mm:ss"));

    System.out.println("秒表.");
    StopWatch sw = new StopWatch();
    sw.start();

    for (Iterator iterator = DateUtils.iterator(new Date(), DateUtils.RANGE_WEEK_CENTER); iterator.hasNext();) {
      Calendar cal = (Calendar) iterator.next();
      System.out.println(DateFormatUtils.format(cal.getTime(), "yy-MM-dd HH:mm"));
    }

    sw.stop();
    System.out.println("秒表计时:" + sw.getTime());

  }

  private String genHeader(String head) {
    String[] header = new String[3];
    header[0] = StringUtils.repeat("*", 50);
    header[1] = StringUtils.center("  " + head + "  ", 50, "^O^");
    header[2] = header[0];
    return StringUtils.join(header, "/n");
  }

  /**
   * @param args
   */
  public static void main(String[] args) {
    LangDemo langDemo = new LangDemo();

    langDemo.charSetDemo();
    langDemo.charSetUtilsDemo();
    langDemo.objectUtilsDemo();
    langDemo.serializationUtilsDemo();
    langDemo.randomStringUtilsDemo();
    langDemo.stringUtilsDemo();
    langDemo.systemUtilsDemo();
    langDemo.classUtilsDemo();
    langDemo.stringEscapeUtilsDemo();
    langDemo.builderDemo();
    langDemo.numberUtils();
    langDemo.dateFormatUtilsDemo();

  }

}